SI52254A-D01AMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The Si52254A-D01AMR is an automotive-grade PCIe clock generator providing four 100 MHz HCSL differential outputs. It supports PCIe Gen1 through Gen5 common clock and SRIS architectures. The device operates on a 1.8–3.3 V supply with a core voltage range of 1.71–3.46 V. It features internal 85 Ω or 100 Ω line matching selectable via the IMP_SEL pin. Jitter performance is rated at 0.05 ps RMS for Gen3/4 and 0.025 ps RMS for Gen5. The component functions within a temperature range of –40 °C to +105 °C and utilizes a 25 MHz crystal input.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Four 100 MHz HCSL differential outputs compliant with PCIe Gen1/2/3/4/5 specifications
• Automotive grade qualification with operating temperatures from –40 °C to +105 °C
• Integrated spread spectrum modulation (0.25% or 0.5% down spread) for EMI reduction
• Hardware control pins for individual output enable, impedance selection, and spread spectrum activation

Clock Generators, PLLs, Frequency Synthesizers Applications

• Infotainment systems
• ADAS Electronic Control Units (ECU)
• Radar sensors
• LiDAR sensors

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify that the specific ordering suffix matches the required package type and tape-and-reel configuration. Confirm that the power supply voltages align with the recommended operating conditions specified in the datasheet. Ensure design compliance with the absolute maximum ratings to prevent permanent device damage during operation or soldering.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when four differential PCIe clock outputs are required for automotive applications. Choose between 85 Ω and 100 Ω internal termination based on the PCB trace impedance requirements using the IMP_SEL pin. Verify that the system can accommodate the 25 MHz crystal input and associated loading capacitors for proper oscillator operation.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5225x family, which includes the eight-output Si52258 variant. Both devices share identical functional characteristics regarding jitter performance, power supply ranges, and automotive grading. The primary distinction lies in the number of available differential outputs and the corresponding package footprint (32-QFN for the Si52254 versus 40-QFN for the Si52258).

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

The Si52258A-D01AMR serves as a direct alternative if eight outputs are needed instead of four, maintaining identical electrical specifications and package compatibility where applicable.